The DAYCO 17mm bearing steel serpentine idler / tensioner pulley for Volvo / Mack is constructed from high-grade bearing steel, designed to offer enhanced durability and longevity. Engineered to maintain precise tension, it reduces wear on belts and other related components. Its smooth operation minimizes noise, leading to a quieter and more comfortable ride. The precision-machined surface ensures consistent belt tracking, effectively preventing slippage. This pulley reliably performs under high loads, supporting efficient power transmission.